Description from Flora of China
Shrubs. Branches upright, 1-3 m; branchlets brownish, glabrous; pith lamellate. Leaves simple; petiole 5-10 mm, pilose or glabrous; leaf blade long elliptic, ovate to lanceolate, or obovate-elliptic, 3.5-12 × 1.5-6 cm, subleathery, adaxially glabrous or pubescent, abaxially densely villous to glabrous, base cuneate to subrounded, margin entire or sparsely and minutely serrate, apex caudate-acuminate oracute. Flowers 1-3 in leaf axils; pedicellate. Calyx lobes tinged with purple, ovate-deltate, 3-4 mm, ciliate. Corolla yellow; tube 4-6 mm; lobes narrowly oblong, 0.7-1.5 cm. Pistil ca. 3 mm in flowers with stamens 5-6 mm or 5-7 mm in flowers with stamens 3-5 mm. Capsule ovoid or lanceolate-ovoid, 0.8-1.8 cm × 4-10 mm, with obscure or sparse lenticels; stalk 2-5 mm. Fl. Mar-May, fr. Jun-Oct. 2n = 28*.
* Woods on slopes, stone crevices in ravines, flood lands; 800-3200 m. SE Gansu, W Henan, Shaanxi, NE Sichuan